caryclark | b6474dd | 2016-01-19 08:07:49 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "gm.h" |
| 9 | #include "SkPath.h" |
| 10 | #include "SkDashPathEffect.h" |
| 11 | |
| 12 | int dash1[] = { 1, 1 }; |
| 13 | int dash2[] = { 1, 3 }; |
| 14 | int dash3[] = { 1, 1, 3, 3 }; |
| 15 | int dash4[] = { 1, 3, 2, 4 }; |
| 16 | |
| 17 | struct DashExample { |
| 18 | int* pattern; |
| 19 | int length; |
| 20 | } dashExamples[] = { |
| 21 | { dash1, SK_ARRAY_COUNT(dash1) }, |
| 22 | { dash2, SK_ARRAY_COUNT(dash2) }, |
| 23 | { dash3, SK_ARRAY_COUNT(dash3) }, |
| 24 | { dash4, SK_ARRAY_COUNT(dash4) } |
| 25 | }; |
| 26 | |
| 27 | DEF_SIMPLE_GM(dashcircle, canvas, 900, 1200) { |
| 28 | SkPaint refPaint; |
| 29 | refPaint.setAntiAlias(true); |
| 30 | refPaint.setColor(0xFFbf3f7f); |
| 31 | refPaint.setStyle(SkPaint::kStroke_Style); |
| 32 | refPaint.setStrokeWidth(1); |
| 33 | const SkScalar radius = 125; |
| 34 | SkRect oval = SkRect::MakeLTRB(-radius - 20, -radius - 20, radius + 20, radius + 20); |
| 35 | SkPath circle; |
| 36 | circle.addCircle(0, 0, radius); |
| 37 | SkScalar circumference = radius * SK_ScalarPI * 2; |
| 38 | int wedges[] = { 6, 12, 36 }; |
| 39 | canvas->translate(radius + 20, radius + 20); |
| 40 | for (int wedge : wedges) { |
| 41 | SkScalar arcLength = 360.f / wedge; |
| 42 | canvas->save(); |
| 43 | for (const DashExample& dashExample : dashExamples) { |
| 44 | SkPath refPath; |
| 45 | int dashUnits = 0; |
| 46 | for (int index = 0; index < dashExample.length; ++index) { |
| 47 | dashUnits += dashExample.pattern[index]; |
| 48 | } |
| 49 | SkScalar unitLength = arcLength / dashUnits; |
| 50 | SkScalar angle = 0; |
| 51 | for (int index = 0; index < wedge; ++index) { |
| 52 | for (int i2 = 0; i2 < dashExample.length; i2 += 2) { |
| 53 | SkScalar span = dashExample.pattern[i2] * unitLength; |
| 54 | refPath.moveTo(0, 0); |
| 55 | refPath.arcTo(oval, angle, span, false); |
| 56 | refPath.close(); |
| 57 | angle += span + (dashExample.pattern[i2 + 1]) * unitLength; |
| 58 | } |
| 59 | } |
| 60 | canvas->drawPath(refPath, refPaint); |
| 61 | SkPaint p; |
| 62 | p.setAntiAlias(true); |
| 63 | p.setStyle(SkPaint::kStroke_Style); |
| 64 | p.setStrokeWidth(10); |
| 65 | SkScalar intervals[4]; |
| 66 | int intervalCount = dashExample.length; |
| 67 | SkScalar dashLength = circumference / wedge / dashUnits; |
| 68 | for (int index = 0; index < dashExample.length; ++index) { |
| 69 | intervals[index] = dashExample.pattern[index] * dashLength; |
| 70 | } |
reed | a439334 | 2016-03-18 11:22:57 -0700 | [diff] [blame] | 71 | p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, 0)); |
caryclark | b6474dd | 2016-01-19 08:07:49 -0800 | [diff] [blame] | 72 | canvas->drawPath(circle, p); |
| 73 | canvas->translate(0, radius * 2 + 50); |
| 74 | } |
| 75 | canvas->restore(); |
| 76 | canvas->translate(radius * 2 + 50, 0); |
| 77 | } |
| 78 | } |